I like the idea of the Ford EDIS ignition system. You put a
multi-toothed wheel on the crank pully, a sensor mounted to the
block under the pully to read the wheel, and run that signal to
a wasted spark ignition system. This system, made by ford, is
on billions of cars all over the planet, and as a result it is
super-duper cheap to put a working distributor-less system
together.

The system can be controlled by an EFI computer to manage the
advance and retard as it sees based on MAP and RPMs. Ideally,
such a thing would allow a hotted up B20 to run differently on
different grades of pump gas.

Is the best way to manage ignition retard based on detonation
with a knock sensor? Where would you mount such a thing on a
B20? Can you detect knocking with an O2 sensor?

It seems clear to me that you'll want to make a motor with a
target octane rating for the fuel, and from that you decide how
to make the combustion chamber and such. It also seems clear
to me that if you have a road car, you'll sometimes have to put
the wrong fuel into the car...

hopefully my html isn't too crazy:



http:/http://www.dainst.com/info/edis/EDIS_system_diagram.png"/www.dainst.com/info/edis/EDIS_system_diagram.png"




and

http://www.alternativeauto.com/waterbox/wb_archives/edis.html


chris